检测浏览器（比如IE）的版本号码是Web 开发最常遇到的问题之一， 以下总结几种检测IE版本号码的方法：

通过Javascript解释浏览器的 User-Agent 字符串：

view plaincopy to clipboardprint? function getInternetExplorerVersion()    // Returns the version of Internet Explorer or a -1    // (indicating the use of another browser).    {      var rv = -1; // Return value assumes failure.      if (navigator.appName == 'Microsoft Internet Explorer')      {        var ua = navigator.userAgent;        var re  = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");        if (re.exec(ua) != null)          rv = parseFloat( RegExp.$1 );      }      return rv;    }    function checkVersion()    {      var msg = "You're not using Internet Explorer.";      var ver = getInternetExplorerVersion();         if ( ver > -1 )      {        if ( ver >= 8.0 )           msg = "You're using a recent copy of Internet Explorer."       else         msg = "You should upgrade your copy of Internet Explorer.";      }      alert( msg );    }   function getInternetExplorerVersion() // Returns the version of Internet Explorer or a -1 // (indicating the use of another browser). {   var rv = -1; // Return value assumes failure.   if (navigator.appName == 'Microsoft Internet Explorer')   {     var ua = navigator.userAgent;     var re  = new RegExp("MSIE ([0-9]{1,}[\.0-9]{0,})");     if (re.exec(ua) != null)       rv = parseFloat( RegExp.$1 );   }   return rv; } function checkVersion() {   var msg = "You're not using Internet Explorer.";   var ver = getInternetExplorerVersion();

  if ( ver > -1 )   {     if ( ver >= 8.0 )        msg = "You're using a recent copy of Internet Explorer."     else       msg = "You should upgrade your copy of Internet Explorer.";   }   alert( msg ); }

通过Javascript判断IE渲染引擎的的当前渲染模式：

view plaincopy to clipboardprint? engine = null;    if (window.navigator.appName == "Microsoft Internet Explorer")    {       // This is an IE browser. What mode is the engine in?       if (document.documentMode) // IE8          engine = document.documentMode;       else // IE 5-7       {          engine = 5; // Assume quirks mode unless proven otherwise          if (document.compatMode)          {             if (document.compatMode == "CSS1Compat")                engine = 7; // standards mode          }       }       // the engine variable now contains the document compatibility mode.    }   engine = null; if (window.navigator.appName == "Microsoft Internet Explorer") {    // This is an IE browser. What mode is the engine in?    if (document.documentMode) // IE8       engine = document.documentMode;    else // IE 5-7    {       engine = 5; // Assume quirks mode unless proven otherwise       if (document.compatMode)       {          if (document.compatMode == "CSS1Compat")             engine = 7; // standards mode       }    }    // the engine variable now contains the document compatibility mode. }

通过ASP.NET 的 HttpBrowserCapabilities 对象:

view plaincopy to clipboardprint? private float getInternetExplorerVersion()    {      // Returns the version of Internet Explorer or a -1      // (indicating the use of another browser).      float rv = -1;      System.Web.HttpBrowserCapabilities browser = Request.Browser;      if (browser.Browser == "IE")        rv = (float)(browser.MajorVersion + browser.MinorVersion);      return rv;    }       private void Page_Load(object sender, System.EventArgs e)    {      string msg;      double ver = getInternetExplorerVersion();      if (ver > 0.0)      {        if (ver >= 7.0)           msg = "You're using a recent version of Internet Explorer.";        else         msg = "You should upgrade your copy of Internet Explorer.";      }       else       msg = "You're not using Internet Explorer.";         Label1.Text = msg;    }   private float getInternetExplorerVersion() {   // Returns the version of Internet Explorer or a -1   // (indicating the use of another browser).   float rv = -1;   System.Web.HttpBrowserCapabilities browser = Request.Browser;   if (browser.Browser == "IE")     rv = (float)(browser.MajorVersion + browser.MinorVersion);   return rv; }

private void Page_Load(object sender, System.EventArgs e) {   string msg;   double ver = getInternetExplorerVersion();   if (ver > 0.0)   {     if (ver >= 7.0)        msg = "You're using a recent version of Internet Explorer.";     else       msg = "You should upgrade your copy of Internet Explorer.";   }    else     msg = "You're not using Internet Explorer.";

  Label1.Text = msg; }

通过HTML的扩展注释语句：

view plaincopy to clipboardprint? <!--[if gte IE 8]>   <p>You're using a recent version of Internet Explorer.</p>   <![endif]-->      <!--[if lt IE 7]>   <p>Hm. You should upgrade your copy of Internet Explorer.</p>   <![endif]-->      <![if !IE]>   <p>You're not using Internet Explorer.</p>   <![endif]>   <!--[if gte IE 8]> <p>You're using a recent version of Internet Explorer.</p> <![endif]-->

<!--[if lt IE 7]> <p>Hm. You should upgrade your copy of Internet Explorer.</p> <![endif]-->

<![if !IE]> <p>You're not using Internet Explorer.</p> <![endif]>

 

有些方法在之前的blog文章提过

MSDN参考文章：(1), (2)